Onyx BOOX 60 Replacement Battery 3.7V 1600mAh 355585

Onyx BOOX 60 / i62M Victoria Series — 3.7V Li-Polymer Replacement Battery (355585)

This is a 3.7V, 1600mAh lithium-polymer cell for the Onyx BOOX 60, BOOX i62M Victoria, and i62ML e-readers. It replaces OEM part numbers 355585 and BBA10. These are large-format e-ink devices — the original cell degrades with repeated charge cycles, leaving the reader unable to hold enough charge for a normal session.

• BOOX 60 / i62M / i62ML shared battery rail: These three models run the same 3.7V cell with matching connector pitch and BMS handshake logic. The PCB protection circuit on each device communicates directly with the cell's onboard protection layer — voltage thresholds and cutoff behaviour are identical across the series.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on e-reader BMS hardware. The protection circuit held cutoff at the correct low-voltage floor, and charge acceptance across the full 1600mAh rated capacity was confirmed before stock is listed.
• First charge after cell swap: Connect via USB immediately after installing and run a complete charge cycle before powering on. The BOOX firmware recalibrates its battery percentage display against the new cell during this first full charge — skipping it causes the indicator to report incorrect readings for multiple subsequent cycles.

Why the BOOX 60 shows low battery immediately after a new cell is installed

Replacement cells ship at storage voltage — typically 3.6V to 3.85V — not at full charge. The BOOX firmware compares resting voltage against its charge table on first boot, and a cell sitting at storage voltage reads as partially or critically discharged. This is not a fault with the cell. Connect the device to USB before attempting to power it on, allow the charge indicator to move, then run the battery to full before the first use cycle.

Battery percentage jumping or stuck after replacement on BOOX i62M / i62ML

The e-reader's fuel gauge is calibrated to the original cell's internal resistance profile. A new cell has a different resistance signature, so the firmware's percentage estimate is unreliable until it completes a full learning cycle. Charge to 100%, use the device until it shuts off at low voltage, then charge fully again. After two full charge-discharge cycles, the percentage readout stabilises at the correct value.